US20220301466A1 - Projection system and stitching method of multiple projection images - Google Patents

Projection system and stitching method of multiple projection images Download PDF

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Publication number
US20220301466A1
US20220301466A1 US17/671,613 US202217671613A US2022301466A1 US 20220301466 A1 US20220301466 A1 US 20220301466A1 US 202217671613 A US202217671613 A US 202217671613A US 2022301466 A1 US2022301466 A1 US 2022301466A1
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Prior art keywords
projection
images
image
devices
projection images
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US17/671,613
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English (en)
Inventor
Hsun-Cheng Tu
Chun-Lin Chien
Chi-Wei Lin
Chien-Chun Peng
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Coretronic Corp
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Coretronic Corp
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Assigned to CORETRONIC CORPORATION reassignment CORETRONIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHIEN, CHUN-LIN, LIN, CHI-WEI, PENG, CHIEN-CHUN, TU, HSUN-CHENG
Publication of US20220301466A1 publication Critical patent/US20220301466A1/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/002—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T3/00—Geometric image transformations in the plane of the image
    • G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
    • G06T3/4038—Image mosaicing, e.g. composing plane images from plane sub-images
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/02—Composition of display devices
    • G09G2300/026—Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0232—Special driving of display border areas
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0442—Handling or displaying different aspect ratios, or changing the aspect ratio
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/12—Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • the disclosure relates to an optical system and a stitching method, and more particularly, to a projection system and a stitching method of multiple projection images.
  • Image stitching of an ultra-short focus projector is an application when projecting large-size images, and when the viewing distance is short, or the disposing space is limited.
  • the ultra-short focus projector is disposed on the same plane as a projection image, or needs to keep a short distance from the disposing surface, the position and number of machines disposed for a stitching application are easily restricted.
  • the stitching of a 2 ⁇ 2 projection image in order to prevent the projector from interfering with the image, it is impossible to add the ultra-short focus projector in the middle of the vertical direction.
  • a horizontal projector is required to stitch more than 2 ⁇ 2 machines, such as 3 ⁇ 2 machines, two different projection directions are used to project.
  • image capturing required for the image processing or interactive application if it is used with an image capturing device that uses the original image capturing angle to complete the automatic stitching and fusion correction, the image capturing distance needs to be extended during imaging capturing, resulting in a decrease in a ratio of the projection image in the imaging capturing image.
  • image capturing due to low resolution of the image capturing, it is difficult to accurately stitch the images in the image processing, or the images may be cut off due to the capturing angle of the image capturing device.
  • the disclosure provides a projection system and a stitching method of multiple projection images, which may effectively improve an effective utilization rate of the projection images, so that the stitched projection images render a favorable effect.
  • An embodiment of the disclosure provides a projection system according an embodiment of the disclosure, which includes multiple projection devices.
  • the projection devices are configured to generate multiple projection images.
  • Each of the projection images partially overlaps with at least one of the adjacent projection images.
  • aspect ratios of the projection images are all greater than 1 or less than 1.
  • a projection direction of one of the projection devices is not parallel to a projection direction of another one of the projection devices.
  • An embodiment of the disclosure provides a stitching method of multiple projection images according an embodiment of the disclosure, which includes the following steps.
  • the projection images are respectively projected by multiple projection devices.
  • Each of the projection images partially overlaps with at least one of the adjacent projection images.
  • aspect ratios of the projection images are all greater than 1 or less than 1.
  • a projection direction of one of the projection devices is not parallel to a projection direction of another one of the projection devices.
  • each of the projection images partially overlaps with the at least one of the adjacent projection images, and in the viewing direction, the aspect ratios of the projection images are all greater than 1 or less than 1. Therefore, the projection system and the stitching method of the projection images may effectively improve an effective utilization rate of the projection images, so that the stitched projection images render a favorable effect.
  • FIG. 1 is a schematic view of a projection system according to an embodiment of the disclosure.
  • FIG. 2 is a schematic perspective view of another projection system according to an embodiment of the disclosure.
  • FIG. 3 is a schematic view of a projection device 100 A and an image capturing device 200 A in FIG. 1 .
  • FIG. 4 is a schematic view of a projection device 100 B and an image capturing device 200 B in FIG. 1 .
  • FIG. 5 is a schematic view of yet another projection system according to an embodiment of the disclosure.
  • FIG. 6 is a schematic view of still another projection system according to an embodiment of the disclosure.
  • FIG. 7 is a flowchart of a stitching method of multiple projection images according to an embodiment of the disclosure.
  • the description of “A” component facing “B” component herein may contain the situations that “A” component directly faces “B” component or one or more additional components are between “A” component and “B” component.
  • the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components are between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
  • FIG. 1 is a schematic view of a projection system according to an embodiment of the disclosure.
  • an embodiment of the disclosure provides a projection system 10 , which includes multiple projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H.
  • the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H may be ultra-short focus projectors, which are configured to generate multiple projection images PA, PB, PC, PD, PE, PF, PG, and PH.
  • FIG. 10 includes multiple projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H.
  • the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H may be ultra-short focus projectors, which are configured to generate multiple projection images PA, PB, PC, PD, PE, PF, PG, and PH.
  • the respective projection images PA, PB, PC, PD, PE, PF, PG, and PH are front projection images, so that a viewer sees a reflected light from a projection surface S.
  • the projection surface S is an opaque surface, such as a projection screen, and the projection surface S may be a flat surface or a curved surface.
  • the viewer and the projection device are located on the same side of the projection surface S.
  • the respective projection images PA, PB, PC, PD, PE, PF, PG, and PH may also be rear projection images, so that the viewer sees a transmitted light from the projection surface S.
  • the projection images PA, PB, PC, PD, PE, PF, PG, and PH are the front projection images and are arranged in an n ⁇ m matrix, and n is greater than or equal to 2, and m is greater than or equal to 1, or n is greater than or equal to 3, and m is greater than or equal to 2.
  • the projection images generated by the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H are arranged in a 4 ⁇ 2 matrix, and the respective front projection images are not interfered by the projection devices.
  • each of the projection images PA, PB, PC, PD, PE, PF, PG, and PH partially overlaps with at least one of the adjacent projection images PA, PB, PC, PD, PE, PF, PG, and PH.
  • the projection image PA generated by the projection device 100 A partially overlaps with the projection images PB, PC, PD, PE, and PH.
  • FIG. 1 illustrates that the projection images PA, PB, PC, PD, PE, and PH partially but not completely overlap, but the disclosure is not limited thereto.
  • a viewing direction OD aspect ratios of the projection images PA, PB, PC, PD, PE, PF, PG, and PH are all greater than 1 or less than 1, and the viewing direction OD is the direction toward (for example, perpendicular to) the projection image PA or the projection surface S.
  • the viewing direction OD is the direction in which the general viewer stands (or sits) without turning his head to face the projection surface S.
  • a width refers to a length in a horizontal direction (for example, the direction parallel to a projection direction D 1 in the embodiment of FIG. 1 )
  • a height refers to a length in a vertical direction (for example, the direction parallel to a projection direction D 2 in the embodiment of FIG. 1 ).
  • the aspect ratio is, for example, 16:9, 4:3, 9:16, 3:4, or depends on design requirements.
  • the projection image having the aspect ratio greater than 1 is defined as a horizontal projection image, for example, a landscape mode
  • the projection image having the aspect ratio less than 1 is defined as a vertical projection image, for example, a portrait mode.
  • Projection directions D 1 , D 2 , D 3 , and D 4 of one of the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H are not parallel to the projection directions D 1 , D 2 , D 3 , and D 4 of another one of the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H (for example, in this embodiment, an included angle between the projection direction D 1 and the projection direction D 2 is about 90 degrees, or between 80 degrees and 100 degrees).
  • the projection directions D 1 , D 2 , D 3 , and D 4 are the directions that the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H face toward centers of the respectively generated projection images PA, PB, PC, PD, PE, PF, PG and PH, that is, light emitting directions of image beams (center beams) of the projection devices.
  • the projection devices of the projection system 10 include the projection device 100 A, 100 D, 100 E, and 100 H (for example, first projection devices), and the projection devices 100 B, 100 C, 100 F, and 100 G (for example, second projection devices).
  • the projection devices 100 A, 100 D, 100 E, and 100 H generate the projection images PA, PD, PE, and PH (for example, first projection images) along the projection direction D 1 (for example, a first projection direction) or the projection direction D 3 (for example, the projection direction D 1 anti-parallel to the projection direction D 3 ).
  • the projection images PA, PD, PE, and PH are the horizontal projection images, and the projection devices 100 A, 100 D, 100 E, and 100 H are in vertical projection modes.
  • the projection devices 100 B, 100 C, 100 F, and 100 G generate the projection images PB, PC, PF, and PG (for example, second projection images) along the projection direction D 2 (for example, a second projection direction) or the projection direction D 4 (for example, the projection direction D 2 anti-parallel to the projection direction D 4 ).
  • the projection images PB, PC, PF, and PG are the horizontal projection images
  • the projection devices 100 B, 100 C, 100 F, and 100 G are the in horizontal projection modes.
  • the aspect ratios of the projection images PA, PD, PE, and PH along the projection direction D 1 or D 3 are different from the aspect ratios of the projection images PB, PC, PF, and PG along the projection direction D 2 or D 4 , and the projection direction D 1 is perpendicular to the second projection direction D 2 .
  • the projection devices 100 A, 100 D, 100 E, and 100 H for example, convert the projection images by using light path turning elements disposed outside the projection devices, so as to generate the projection images PA, PH, PD, and PE with the aspect ratios of less than 1 along the projection direction D 1 or D 3 of the projection devices.
  • the disclosure is not limited thereto.
  • the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H may all be disposed on the same plane.
  • the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H and the projection surface S are all disposed on the same plane, but the disclosure is not limited thereto.
  • the aspect ratios of the projection images PA, PB, PC, PD, PE, PF, PG, and PH may be greater than 1 or less than 1, respectively.
  • the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H are the ultra-short focus projectors, the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H of the projection system 10 may still be disposed on the same plane to enable the projection images be arranged in the n ⁇ m matrix.
  • multiple projection devices may only provide projection images with the same aspect ratio, and the projection images generated by the projection devices cannot be arranged in a matrix that includes 2 ⁇ 3 or more when the projection devices are all disposed on the same plane.
  • FIG. 2 is a schematic perspective view of another projection system according to an embodiment of the disclosure.
  • the projection devices are respectively disposed at least on two different planes.
  • the projection devices 100 A and 100 H are disposed on a disposing surface F 1 .
  • the projection devices 100 B and 100 C are disposed on a disposing surface F 2 .
  • the projection devices 100 D and 100 E are disposed on a disposing surface F 3 , and the projection devices 100 F and 100 G are disposing on a disposing surface F 4 .
  • the disposing surfaces F 1 , F 2 , F 3 , and F 4 are perpendicular to the projection surface S, and the disposing surfaces F 1 and F 3 are perpendicular to the disposing surfaces F 2 and F 4 .
  • the disposing surfaces F 1 and F 3 are wall surfaces.
  • the disposing surface F 2 is a ceiling, and the disposing surface F 4 is a floor.
  • the projection images PA, PB, PC, PD, PE, PF, PG, and PH are all the vertical projection images.
  • the projection devices 100 A, 100 D, 100 E, and 100 H are in the horizontal projection modes, and the projection devices 100 B, 100 C, 100 F, and 100 G are in the vertical projection modes. In FIG.
  • shortest distances between the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H and the projection surface S are substantially the same, so that the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H are substantially located on a plane parallel to the projection surface S.
  • the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H are respectively disposed on at least two different planes.
  • the shortest distances between the projection devices 100 A, 100 D, 100 E, and 100 H and the projection surface S are substantially the same, and the shortest distances between the projection devices 100 B, 100 C, 100 F, and 100 G and the projection surface S are substantially the same.
  • the shortest distance between the projection device 100 A and the projection surface S is different from the shortest distance between the projection device 100 B and the projection surface S. Therefore, the projection devices 100 A, 100 D, 100 E, and 100 H are located on the same plane, and the projection devices 100 B, 100 C, 100 F, and 100 G are located on another plane.
  • the shortest distances between the projection device 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H and the projection surface S may be determined according to the design requirements.
  • FIG. 3 is a schematic view of a projection device 100 A and an image capturing device 200 A in FIG. 1 .
  • FIG. 4 is a schematic view of a projection device 100 B and an image capturing device 200 B in FIG. 1 .
  • the projection system 10 further includes multiple image capturing devices 200 A, 200 B, 200 C, 200 D, 200 E, 200 F, 200 G, and 200 H, which are configured to detect image aspect ratios and an image coordinate accuracy of the projection images PA, PB, PC, PD, PE, PF, PG and PH (for example, through a grid point identification).
  • the image capturing devices 200 A, 200 B, 200 C, 200 D, 200 E, 200 F, 200 G, and 200 H respectively correspond to the different projection images PA, PB, PC, PD, PE, PF, PG, and PH to generate multiple image capturing images.
  • the image capturing device 200 A corresponds to the projection image PA to generate an image capturing image TA, as shown in FIG. 3 .
  • the image capturing device 200 B corresponds to the projection image PB to generate an image capturing image TB, as shown in FIG. 4 .
  • the image capturing devices 200 A, 200 B, 200 C, 200 D, 200 E, 200 F, 200 G, and 200 H are preferably disposed next to the corresponding projection devices.
  • the projection system 10 is provided with the corresponding image capturing devices 200 A, 200 B, 200 C, 200 D, 200 E, 200 F, 200 G, and 200 H, the stitching effect of the projection images PA, PB, PC, PD, PE, PF, PG, and PH generated by the projection system 10 is better.
  • the image capturing device 200 A, 200 B, 200 C, 200 D, 200 E, 200 F, 200 G, and 200 H may change an image capturing direction according to the horizontal projection mode or the vertical projection mode of the corresponding projection device.
  • the aspect ratio of the projection image PA along the projection direction D 1 of the projection device 100 A is less than 1
  • the aspect ratio of the image capturing image TA corresponding to the projection image PA is less than 1, as shown in FIG. 3 .
  • the aspect ratio of the projection image PB along the projection direction D 2 of the projection device 100 B is greater than 1
  • the aspect ratio of the image capturing image TB corresponding to the projection image PB is greater than 1, as shown in FIG. 4 .
  • the image capturing images TA and TB may completely cover the corresponding projection images PA and PB, and also cover a portion of the adjacent projection images. Therefore, the projection system 10 may render a much better stitching effect of the projection images PA, PB, PC, PD, PE, PF, PG, and PH.
  • each of the projection images PA, PB, PC, PD, PE, PF, PG, and PH partially overlaps with the at least one of the adjacent projection images, and when the projection directions D 1 , D 2 , D 3 , and D 4 of the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H may not be parallel to each other, in the viewing direction OD, the aspect ratios of the projection images PA, PB, PC, PD, PE, PF, PG, and PH are all greater than 1 or less than 1. Therefore, the projection system 10 may effectively improve the effective utilization rate of the projection images, so that the stitched projection images render a favorable effect.
  • an image magnification rate of each of the projection images PA, PB, PC, PD, PE, PF, PG, and PH is not different from the aspect ratio thereof. Therefore, the overall brightness and resolution of the projection images are better.
  • FIG. 5 is a schematic view of yet another projection system according to an embodiment of the disclosure.
  • a projection system 10 ′ of FIG. 5 is similar to the projection system 10 of FIG. 1 , and the main difference is that the projection images PB, PA, and PH generated by the projection devices 100 B, 100 A, and 100 H are arranged in a 3 ⁇ 1 matrix.
  • the projection direction of the projection device 100 B are not parallel to that of the projection device 100 A, and the projection direction of the projection device 100 H is parallel to that of the projection device 100 A.
  • Three sides of the projection image PB partially overlap with the adjacent projection image PA, and three sides of the projection image PH partially overlap with the adjacent projection image PA.
  • an n ⁇ 1 matrix may be arranged along the projection direction D 2 , and n may be greater than 3. That is, the projection devices may be disposed in the direction of the projection direction D 2 to extend the stitched projection images.
  • FIG. 6 is a schematic view of still another projection system according to an embodiment of the disclosure.
  • a projection system 10 ′′ of FIG. 6 is similar to the projection system 10 of FIG. 1 , and the main difference is that the projection system 10 ′′ includes the projection devices 100 A, 100 B, 100 D, and 100 G, and the projection image PA may almost completely overlap with at least one of the projection images PB, PD, and PG.
  • the projection image PA almost completely overlaps with the projection images PB, PD, and PG.
  • the respective projection devices of the projection system 10 ′′ may generate the projection images from different directions.
  • the almost complete overlap of the projection images refers to an overlapping area that is greater than or equal to 95% or more or 98% or more of the projection image.
  • the overlapping area of the projection image PA and the at least one of the projection images is greater than or equal to 95% of the projection image PA.
  • an area of the black image (non-overlapping area) where the projection image PA does not display an image is less than 5% of the projection image PA.
  • the projection system 10 ′′ of the disclosure may render a good effect of projection brightness by overlapping the projection images from different directions (or at least three or more directions). Multiplying the brightness of the overlapping area is beneficial to use the projection system 10 ′′ according to the embodiment of the disclosure in an environment with a bright background light.
  • FIG. 7 is a flowchart of a stitching method of multiple projection images according to an embodiment of the disclosure.
  • the stitching method of the projection images includes the following steps.
  • step S 100 the projection images PA, PB, PC, PD, PE, PF, PG, and PH are respectively projected by the projection devices 100 A, 100 B, 100 C, 100 D, 100 E, 100 F, 100 G, and 100 H.
  • the projection images PA, PD, PE, and PH along the projection direction D 1 or D 3 are the vertical projection images
  • the projection images PB, PC, PF, and PG along the projection direction D 2 or D 4 are the horizontal projection images.
  • each of the projection images PA, PB, PC, PD, PE, PF, PG, and PH partially overlap with the at least one of the adjacent projection images.
  • the aspect ratios of the projection images PA, PB, PC, PD, PE, PF, PG, and PH are all greater than 1 or less than 1.
  • the stitching method of the projection images further includes the following step.
  • step S 130 the image capturing images are generated by the image capturing devices 200 A, 200 B, 200 C, 200 D, 200 E, 200 F, 200 G, and 200 H respectively corresponding to the different projection images PA, PB, PC, PD, PE, PF, PG, and PH.
  • the stitching method of the projection images further includes the following steps.
  • step S 140 at least one of the first projection images PA, PD, PE, and PH are generated by at least one of the first projection devices 100 A, 100 D, 100 E, and 100 H along the first projection direction D 1 or D 3 .
  • At least one of the second projection images PB, PC, PF, and PG are generated by at least one of the second projection devices 100 B, 100 C, 100 F, and 100 G along the second projection direction D 2 or D 4 .
  • each of the projection images partially overlaps with the at least one of the adjacent projection images, and when the projection directions of the projection devices may not be parallel to each other, in the viewing direction, the aspect ratios of the projection images are all greater than 1 or less than 1. Therefore, the projection system and the stitching method of the projection images may effectively improve the effective utilization rate of the projection images, so that the stitched projection images render the favorable effect.
  • the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred.
  • the invention is limited only by the spirit and scope of the appended claims. Moreover, these claims may refer to use “first”, “second”, etc. following with noun or element. Such terms should be understood as a nomenclature and should not be construed as giving the limitation on the number of the elements modified by such nomenclature unless specific number has been given.
  • the abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Projection Apparatus (AREA)
  • Controls And Circuits For Display Device (AREA)
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